<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .bg{
            background: url(images/logo0.png) no-repeat;
            width: 250px;
            height: 80px;
        }
        @media (max-width:768px){
            .bg{
                background: url(images/logo.ico) no-repeat;
            }
        }
    </style>
</head>
<body>
    <div class="bg">
        
    </div>
</body>
</html>